Plastics joint

Claim 1

A pivotal mounting comprising a resilient one-piece plastics sleeve having a generally cylindrical bore, the radially inner surface of which, when viewed along the axis, has a first number of radial undulations spaced around its circumference, in combination with a generally cylindrical member which is a one-piece plastics moulding and lies substantially coaxially within the bore, said cylindrical member also including a bore having means for nonrotatably accepting a substantially rigid rod, the radially outer surface of the member, when viewed along the axis, having a second number of radial undulations spaced around its circumference, both numbers being greater in value than one, and being different, the arrangement being such that each set of said undulations can register firmly with the other at a third number of relative angular positions of the sleeve and the member, the third number being greater than the first and second numbers, each position of firm registration results from the engagement of an undulation on the sleeve with an undulation of complementary cross-section on the member, and the inner cylindrical surface of the sleeve and the outer surfaces of the member are proportioned such that those undulations of the sleeve which are not in firm registration with an undulation of said member results in a generally radial out of round distortion of said resilient sleeve and means for mounting said sleeve to a supporting apertured workpiece.